Wall-dressing machine.



P. ZOBOU @L G. VICENTINL WALL DRESSING MACHINE. APPLxcTloN mib aac. 13. 1915.'

Patented Mar. 21, 1916.

3 SHEETS-SHEET l.

P. ZOBOLI L G. VICENTINI.

WALL DRESSING MACHINE.

APPLICATION HLED DEC. 13, 1915.

Patented Mar. 21, 1916.

3 SHEETS-SHEET Z.

P. ZOBOLI 6L G. VICENTINI.

WALL DRESSING MACHINE. APPLlcTloN man Dsc. 13, 1915.

Patented M311'. 21, 1916.

l3 SHEETS-SHE?!F 31 i WALL-DRESSING MACHINE.

Specification of Letters Patent.

Patented Mar. 21, 1916.

Application led December 13, 1915. Serial No. 66,465.

To all whom t may concern Be it known that we, PARTEMIO ZOBOLI and GIOVANNI VICENTINI, subjects of the Kingl of Italy, residing at Cambridge, in the county of Middlesex and State of Massachusetts, have invented new and useful Improvements in )Vall-Dressing Machines, of which the following is a specification.

This invention relates to machines for forming a smooth surface on the vertical wall of a building or of an apartment, the material of the wall being of such nature that it is capable of being rendered smooth by abrasion or grinding, and being, for eX- ample, of concrete or other artificial stone, or of natural stone, such as ashler, marble, etci, and the surface formed by the machine of our invention being either on the exterior or the interior of a building.

The invention is embodied in a machine comprising an electric or other motor, a rotary dressing wheel driven by the motor and adapted to form a smooth surface on a rela- -tively rough vertical wall, and a framework having provisions for presenting the wheel to the wall in such manner that the area of the surface formed thereby may be gradually increased without moving the framework as a whole, first, by successive adjustments of the Wheel within the'area of the framework, and,v secondly, by changes of position of the framework from time to time.

Of the accompanying drawings forming a part of this specification: Figure 1 represents a front elevation of a machine embodying our invention; Fig. 2 represents a rear elevation of the same; Fig. 3 represent-s a section on line 3 3 of Fig. 1; Fig. 4 represents a section on line 4-4 of Fig. 1; Fig. 5 represents a perspective view showing the parts of the framework called the main frame and the lift; Fig. 6 represents a perspective view showing the part of the framework called the carriage; Fig. represents a section on line 7-7 of Fig.4 1; Fig. 8 represents a side view, and Fig. 9 an edge view of a dressing Wheel adapted for polishing; Fig. 10 represents a section on the line 10 of Fig. 3.

The same reference characters indicate the same or similar parts in all the views. The framework of the machine includes a horizontally movable main frame, indicated as a whole by a (Fig. 5), mounted on wheels a' and adapted to travel endwise on a horizontal support such as a floor, pavement, or staging, a vertically adjustable frame, indicated as a whole by b, guided in a vertical pathl by the upright corner members a2 of the frame a, and hereinafter called the lift, and a horizontally adjustable frame, indicated as a whole by c (Fig. 6), and hereinafter called the carriage,

rights a2, as shown by Figs. 2 and 4. The Vlift 1s adjustable vertically to locate'the driving wheel at any desired height, and is provided with a rack 12 connected with the carriage c and meshing with a pinion 13 (Fig. l) on a shaft 14., which is journaled 1n bearings on a sliding table 15, which is movable horizontally on the upper horizontal members a? of the main frame, said table-having ears 15El carrying rollers 15b adapted to run on said members a3.

The shaft 14 is provided with a hand wheel 16 by which it may be rotated to raise and lower the lift. Said shaft and hand wheel constitute a manually movable operating member.

The carriage o is provided with rollers c (Fig. 6), which run upon the horizontal members b3 of the lift as best shown by Fig. 2, the carriage being therefore horizontallv adjustable on the lift in a direction at right angles with the axis of the dressing wheel d.

To the casing of the motor e are rigidly attached frame members e (Figs. 3 and 4), said frame members 'being provided with rollers e2 running on the inner sides of the l horizontal members c2 of the carriage. The motor, its shaft e3, and the dressing wheel ci attached thereto are therefore movable to project or press the wheel outwardly against the vertical face of the wall indicated by theline (Fig. 3).

The frame e is yieldingly pressed against lthe wall by springs 18 (Figs. 3 and 4),

which are `preferably elongated helical springs connected at their ends to. brackets 19 on the frame e and bearing on studs or rollers 20 (Figs. '3, 4 and 6) on the carriage @,Vthe springs being angularly arranged, as best shown by Fig. 4, and exerting an outward pull on the frame e tending topress the dressing wheel against the wall.

The frame e and the motor and dressing wheel carried thereby may be retracted from the wall by the operator by means including a treadle 22 pivoted at Q3 to a slide '24 which isv movable on. the member a* of the main frame, and a iexible reti-acting cord 25 connected at its lower end with said treadle and at its upper end with the table 15. a bight of said cord engages a pulley 26 connected with the motor frame members e', and is guided by pulleys 27 (Figs. 3 and 6) mounted on the carriage. When the treadle 9x2 is released, the motor and wheel are held yieldingly projected by the spring 18. When the treadle is depressed by the operators foot the bight of the cord 25 is partly taken up and the motor and wheel are retracted.

It will now be seen that the wheel ci is movable horizontally toward and from the wall independently of the carriage c, that the carriage and wheel are adjustable horizontally together parallel with the wall independently of the lift b, and that the lift, the carriage, and the wheel are adjustable vertically together parallel with the wall by thelift. The wheel is therefore adapted to operate on an area of the wall corresponding to the area of the main frame without movement of the latter, the wheel being allowed to remain in one position in contact with the wall for a sufficient period, and adjusted by movements of the carriage and lift to gradually enlarge the dressed portion of the work until an area coexten1 sive with the area of the main frame has been dressed. After said area has been dressed, the main frame may be moved along preparatory to the dressing of another area.

The carriage C, the rack 12 connected therewith, the table 15 supporting the pinion shaft 14, and the treadle-supporting slide 24 may be adjusted horizontally by hand from time to time to shift the wheel laterally in a. horizontal direction. The main frame may be supported by a floor or pavement. or by a staging above the floor or pavement.

later is supplied to the work by a tank `30 mounted on the sliding table 15, and a water trickles therefrom to the portionof the work with which the wheel is in contact.

rl`he dressing wheel d, shown by Figs. 1,

shaft, and when the wall is to be polished a circular body 3S) (Fig. 9), preferably of wood having ay facing 40 of felt, may be substituted for the lblocks 37. Said facing may have grooves 41 formed by pressing portions of the facing linto corresponding grooves in the body 39. The disk 3G and the acting portion of the wheel may be held yieldingly spaced apart by springs 42 (Fig. 9) on studs 43 adapted to slide in orifices in the disk.

The counterbalaneing weights 5 may be relied upon as the means for holding the lift and its load at any desired vertical adjustment. )Ve prefer however to provide more positive means for this purpose, such as the means for frictionally resisting the rotation of the pinion shaft 14, shown by F ig. 10, said means including brake members attached to the table 15, land a screw 46 adapted to press said members frictionally against the shaft 14, said screw having a handle 47. lVhen the brake members 45 are set up against the shaft 14, they resist the rotation of the shaft suficiently to prevent accidental vertical movement of the rack 12 and the lift. The counterbalancing weights 5 cooperate with said frictional means in holding the lift at the desired adjustment.

Means may be provided for frictionally resisting horizontal movement of the carriage on the lift, and of the table 15 on the main frame. Fig. 3 shows a screw 49 which may cooperate with suitable brake members in resisting` movement of the carriage on the lift, and a.' screw 50 which may coperate with suitable brake members in resisting movement of the table 15 on the main frame.

Having described our invention, we claim:

1. A wall dressing machine comprising a portable main frame, a lift vertically adjustable on the main frame, a carriage horizontally adjustable on the lift, a motor mounted directly on the carriage and movable therewith, and a `rotary dressing wheel directly supported and driven by the motor.

2. A wall dressing machine comprising a m yieldingly maintaining the lift j airaaea able therewith, a rotary dressing wheel directly supported and driven by the motor, counterbalancing means being provided for at any position to which it may be vertically' adjusted, and t'rictional securing means cooperating with said counterbalancing means.

3. A wall dressing machine comprising a* portable main frame, a lift vertically adj ustable on the main frame, a carriage horizontally adjustable on the lift and vertically movable therewith, a motor mounted directly on the carriage and movable therewith, a rotary dressing wheel directly supported and driven by the ually operated mechanism for vertically adjusting the lift, said mechanism including a manually operated member movable horizontally with the carriage, and connections between said member and the carriage, said carriage when moved vertically also moving the lift.

i. A wall dressing machine comprising a portable main frame. a lift vertically adjustable on the main frame, a carriage horizontally adjustable on the lift, a motor mounted on the carriage, a rotary dressing wheel driven by the motor, a vertical rack movable horizontally with the carriage, a sliding table movable horizontally on the main frame, and a manually operable shaft journaled on said table and provided with a pinion meshing with said rack and adapted to vertically adjust the rack, carriage. and lift, and to conform to horizontal adjustments of the carriage.

5. A wall dressing machine comprising a portable main frame. a lift vertically adjustable 'on the main frame, a carriage horizontally adjustable on the lift, a motor mounted on the carriage, a rotary dressing wheel driven by the motor, a vertical rack movable horizontally with the carriage, a sliding table movable horizontally on the main frame, and a manually operable shaft journaled on said table and provided with a pinion meshing with said rack and adapted to vertically adjust the rack. carriage, and lift. and to conform to horizontal adjustments of the carriage, the table being provided with frictional means for resisting the rotation of said shaft to maintain the lift at any desired vertical adjustment.

6. A wall dressing machine comprising -a portable main frame. a lift vertically adjustable on the main frame, a carriage hori` zontally' adjustable on the lift. a motor mounted directly on the carriage and movable therewith, a rotary dressingwheel directly supported and driven by the motor, ind counterbalancing means connected with `:he main frame and lift and adapted to vieldingly maintain the litt at any position o which it mav be vertically adjusted.

'i'. wall dressing machine comprising 'a motor, and manportable main frame, a lift vertically adj ustable on the main frame, a carriage horizontally adjustable on the lift, a motor mounted on the carriage, a rotary dressing wheel driven by the motor, a vertical rack movable horizontally with the carriage, a sliding table movable horizontally on the main frame, and a manually operable shaft journaled on said table and provided with a pinion meshing with said rack and adapted to vertically adjust the rack, carriage, and lift, and to conform to horizontal adjustments of the carriage, the table being provided with frictional means for resisting the rotation of said shaft to maintain the lift at any desired vertical adjustment, and counter-balancing means connected with the main frame and lift, and cooperating with said frictional means in holding the lift at any position to which it may be vertically adjusted.

8. A wall dressing machine comprising a portable main frame, a lift vertically adj ustable on the main frame, a carriage horizontally adjustable on the lift, a motor mounted directly on the carriage and movable therewith, a rotary dressing wheel directly supported and driven by the motor, the motor and wheel being horizontally movable toward and from the work, and resilient means manually pressing the wheel yieldingly outward against the work.

9. A wall dressing machine comprising a portable main frame. a lift vertically adrectly supported and driven by the motor, the motor and wheel being horizontally movable toward and from the work, resilient means manually pressing the wheel yieldingly outward against the work. and means controlled by the operator for retracting the wheel from the work.

10. A, wall dressing machine comprising' a portable main frame, a lift vertically adjustable on the main frame, a carriage horizontallyT adjustable on the lift, a motor mounted on the carriage, a rotary dressing wheel driven by the motor, the motor and wheel being horizontally movable toward and from the work, means for pressing the wheel yieldingly against the work, and means controlled by the operator for retracting the wheel from the work. said means including a treadle supported by the main frame, a cord connected at one end to said treadle` an elevated support on the main Jframe to which the other end of said cord is connected, a pair of cord guides con` nected with the carriage. and a bight-forming cord guide connected with the motor.

ll. A wall dressing machine comprising a portable main frame, a lift vertically adjustable on the main frame, a carriage horithe carriage and lift, a tank on said table,

zontally adjustable on the lift, a motor and a conduit extending from said tank to a 10 mounted on the carriage, a rotary dressing point over the Wheel. wheel driven by the motor, a lvertical rack InV testimony whereof we have aixed our 5 movable horizontally with the carriage, a signatures;

sliding table movable horizontally on the 4 4 main frame, means connected with the said PARTEMIO ZOBOLI. carriage and table for vertically adjusting GIOVANNI VICENTINI. 

